There were a few well known companies that were merged into IG Farben, and they were split back out after the war.

Several of them still exist and are very well known. There were also spinoffs and mergers that happened later, and bit sand pieces of some very large chemical and pharmaceutical companies can trace parts of their lineage back to IG Farben.

The summary on Wikipedia covers it pretty decently.

Bayer aquired Monsanto, not the other way round. But yeah, these two companies truely are a fit made... well not heaven but maybe the hotter counter part of it.

Please don't knock Bayer.

Those are the chaps, after all, that developed (and trademarked) Heroin.

As a cough medicine for children.

(I really hope that this doesn't need a <sarcasm> tag)

>seamlessly became Bayer after the war, with same folks running it

Well, there was the war crimes trial for executives in IG Farben, as well as for other industrialists. Not exactly seemless.

https://en.wikipedia.org/wiki/IG_Farben_Trial

>Of the 24 defendants arraigned, 13 were found guilty on one or the other counts of the indictment and sentenced to prison terms ranging from one and one half to eight years, including time already served; 10 defendants were acquitted of all charges.

That's only a little stiffer than what happens to a US company when the SEC discovers fraud.

The SEC has no authority to prosecute criminal complaints and cannot put anyone in jail.

they certainly can and have referred their cases to law enforcement agencies for criminal investigation